package org.jeecg.modules.shiro.authc.aop;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSON;
import com.auth0.jwt.JWT;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
import org.jeecg.common.api.vo.Result;
import org.jeecg.common.constant.CommonConstant;
import org.jeecg.common.exception.JeecgBootException;
import org.jeecg.common.system.api.ISysBaseAPI;
import org.jeecg.common.system.util.JwtUtil;
import org.jeecg.common.system.vo.LoginUser;
import org.jeecg.common.util.RedisUtil;
import org.jeecg.modules.shiro.authc.JwtToken;
import org.jeecg.modules.shiro.vo.DefContants;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;

/**
 * @Description: 鉴权登录拦截器
 * @Author: Scott
 * @Date: 2018/10/7
 **/
@Slf4j
public class JwtFilter extends BasicHttpAuthenticationFilter {

    private RedisUtil redisUtil;

    private ISysBaseAPI sysBaseAPI;

    public JwtFilter(RedisUtil redisUtil, ISysBaseAPI sysBaseAPI) {
        this.redisUtil = redisUtil;
        this.sysBaseAPI = sysBaseAPI;
    }

    /**
     * 执行登录认证
     *
     * @param request
     * @param response
     * @param mappedValue
     * @return
     */
    @SneakyThrows
    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
        try {
            executeLogin(request, response);
            return true;
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/json; charset=utf-8");
            PrintWriter writer = response.getWriter();
            if (e.getCause() instanceof JeecgBootException) {
                JeecgBootException ex = (JeecgBootException) e.getCause();
                writer.write(JSON.toJSONString(Result.error(ex.getCode(), ex.getMessage())));
            } else {
                writer.write(JSON.toJSONString(Result.error(401, e.getMessage())));
            }
            writer.flush();
            IoUtil.close(writer);
            return false;
        }
    }

    /**
     *
     */
    @Override
    protected boolean executeLogin(ServletRequest request, ServletResponse response) throws Exception {

        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        //采集信息请求直接放行
        String method = httpServletRequest.getRequestURI();
        if("/admin/fillInInfo/add".equals(method) || "/admin/fillInInfo/getFillInInfoList".equals(method) || "/admin/fillInInfo/getFillInInfoByChannelList".equals(method)){
            return true;
        }
        String token = httpServletRequest.getHeader(DefContants.X_ACCESS_TOKEN);
        String cacheToken = String.valueOf(redisUtil.get(CommonConstant.PREFIX_USER_TOKEN + token));
        if (StrUtil.isBlank(cacheToken)) {
            throw new JeecgBootException(401, "登陆失效，请重新登录!", null);
        }
        String userName = JwtUtil.getUsername(token);
        if (StrUtil.isBlank(userName)) {
            throw new JeecgBootException(401, "登陆失效，请重新登录!", null);
        }
        LoginUser loginUser = sysBaseAPI.getUserByName(userName);
        Integer platform = Convert.toInt(JWT.decode(token).getClaim("platform").asString());
        JwtToken jwtToken = new JwtToken(loginUser.getUsername(), loginUser.getPassword(), loginUser.getPhone(), "", platform);
        log.info("jwt 获取到的 token:" + token);
        jwtToken.setToken(token);
        //         提交给realm进行登入，如果错误他会抛出异常并被捕获
        getSubject(request, response).login(jwtToken);
        // 如果没有抛出异常则代表登入成功，返回true
        return true;
    }

    /**
     * 对跨域提供支持
     */
    @Override
    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        log.debug(httpServletRequest.getRequestURL().toString());
        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
        httpServletResponse.setHeader("Content-Security-Policy", "default-src 'self'; script-src 'self'; frame-ancestors 'self'; object-src 'none'");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
        // 跨域时会首先发送一个option请求，这里我们给option请求直接返回正常状态
        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
            httpServletResponse.setStatus(HttpStatus.OK.value());
            return false;
        }
        return super.preHandle(request, response);
    }
}
